Tornadoes cannot collapse in on themselves. In many cases a tornado will become much narrower as it enters its dissipating stage, and is said to be "roping out." During this stage the winds in the tornado may actually speed up as angular momentum is conserved. It is still considered a tornado until it dissipates completely.
When a volcano collapses into itself at its top, it forms a large crater called a caldera. Calderas are formed when the magma chamber of a volcano empties during an eruption, causing the summit to collapse inward.
It forms a 'caldera'.
When a volcano collapses on itself a caldera is then formed.
calderacalderaIt forms a caldera.
When a larger volcano collapses in on itself, it forms a caldera, not a whig. A caldera is a large depression that results from the explosive eruption and subsequent collapse of the volcano's summit. This geological feature can often fill with water, creating a lake, or become a site for new volcanic activity. The term "whig" does not pertain to volcanic formations and may be a misunderstanding or typo.
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A tornado forms from the rotating updraft of a thunderstorm. The updraft of the tornado creates low pressure that causes air to spiral inward (usually counterclockwise int he northern hemisphere and clockwise in the southern) and then upward.
When a volcano collapses on itself a caldera is then formed.
a tornado is formed by a thunderstorm
When a volcanic cone collapses it forms a caldera.
When rock above a cave collapses, a sinkhole is formed.
To a degree. A tornado is often made visible by a cloud known as a condensation funnel or funnel cloud. The tornado itself is not a cloud, however, but a violent rotating windstorm. The condensation funnel is sometimes absent in a tornado.